Twin actresses Mary-Kate and Ashley Olsen take their "first public selfie ever" in this photo posted by the Sephora cosmetic company on Wednesday, April 13.

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A star-studded group takes a selfie on Thursday, April 7. From left are comedian Chris Rock, rapper Andre 3000, DJ D-Nice, musician Jarobi White, musician Jack White and comedian Dave Chappelle. "Hard at work on the new Andre 3000 album," Rock joked (we think) on Instagram.

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Actor Jordan Peele, left, tweeted a photo with his "Keanu" co-stars Keegan-Michael Key and Keanu the cat on Wednesday, April 13. "Keanu, Key and I are bouncing around ATL right now," he said. "See the movie and adopt a cat pls."

Model Rosie Huntington-Whiteley, second from right, posted this selfie from the "Hot Mess" birthday party of actress Kate Hudson, left, on Sunday, April 24. Joining them in the shot: model Kelly Sawyer, second from left; writer Derek Blasberg, center; and model Poppy Delevingne, far right.

The United Nations posted this selfie of actor Leonardo DiCaprio to its Twitter account on Friday, April 22. DiCaprio was designated a U.N. Messenger of Peace in 2014.

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Basketball star Kobe Bryant poses with two young fans in Houston on Sunday, April 10. Bryant retired from the NBA this month, scoring 60 points in his final game.

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Musician will.i.am, second from right, visits a migrant camp in Calais, France, on Wednesday, April 13.

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A woman in London takes a selfie in front of a Queen Elizabeth II portrait on Tuesday, April 19. The Queen celebrated her 90th birthday this month.

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Baseball star Bryce Harper snaps a selfie with an unsuspecting fan on Monday, April 25. "Just some shenanigans on the off day at the @smithsonian Natural History museum!" Harper said on Instagram.

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People take a selfie in front of First Avenue, the Minneapolis nightclub featured in the movie "Purple Rain," on Thursday, April 21. Prince, the iconic musician who starred in the film, died earlier in the day. He was 57.

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Xosha Roquemore, left, attends a party with fellow actresses Mindy Kaling, center, and Ashlee Olivia Jones on Sunday, April 24.

People pose in front of the gender-neutral restroom they lobbied for in the Los Angeles school district on Tuesday, April 19.

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Actress Daisy Ridley enjoys some pizza as she attends her first basketball game on Sunday, April 10. "We tried all sorts of poses but I definitely look best in this glorious selfie," she said on Instagram.

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Villanova basketball players take part in a championship parade on Friday, April 8. Earlier in the week, the Wildcats won the NCAA title on a buzzer-beating 3-pointer.

Singer Demi Lovato and football player Michael Sam take a selfie at the GLAAD Media Awards on Saturday, April 2.

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Actress Maisie Williams brought extra snacks to some fans' "Game of Thrones" viewing party on Sunday, April 24. She also tried some of their snacks. "Thanks for the dragon egg cookies, they were THA BOMB," she said on Instagram.

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Actor Josh Duhamel takes a selfie in the cockpit as he flies with the U.S. Air Force "Thunderbirds." "What an honor," he tweeted on Saturday, April 16.

Bertrand Piccard takes a selfie aboard a solar-powered plane during a test flight over the Pacific Ocean on Saturday, April 9.

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Democratic presidential candidate Hillary Clinton pauses for a selfie at a campaign event in Los Angeles on Saturday, April 16.

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A man takes a selfie after lighting up a joint in front of the White House on Saturday, April 2. Dozens of protesters were calling for the legalization of marijuana.

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A man takes a selfie on the roof of an abandoned building in Pripyat, Ukraine, on Friday, April 22. Workers of the Chernobyl nuclear plant lived there 30 years ago, before an explosion tore through a reactor in April 1986.

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Saul "Flip" White, a member of the Harlem Globetrotters, uses a selfie stick during an exhibition game in Las Vegas on Tuesday, April 19.

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Radio host Jenny McCarthy takes a selfie with hip-hop duo Salt-N-Pepa on Tuesday, April 19.

WWE superstar Natalya snaps a selfie in the mirror on Thursday, April 7. "See you later," she said on Instagram.

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Baseball fans in Baltimore take a selfie on Opening Day, Monday, April 4.

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Ohio Gov. John Kasich, a Republican presidential candidate, poses for a selfie in New York on Thursday, April 7.

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Actress Brie Larson announces that she will be hosting an upcoming episode of "Saturday Night Live." "DON'T PANIC BECAUSE I'M NOT PANICKING GAAAAHHHHHH!!!" she said on Instagram on Sunday, April 17. "So super excited! Hope you're ready @nbcsnl. We will dance on May 7th!"

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U.S. Vice President Joe Biden takes a selfie Thursday, April 14, as he greets guests during the Wounded Warrior Ride, a cycling event to help wounded members of the military.

Rapper Snoop Dogg, right, works with producer Jazze Pha on Tuesday, April 26. "Cadillac music coming soon," Snoop said on Instagram.

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A man in Aleppo, Syria, takes a selfie in front of a missile that landed in a field on Tuesday, April 26.

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U.S. Sen. Ted Cruz, a Republican presidential candidate, uses a selfie stick during a campaign rally in Irvine, California, on Monday, April 11.

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Actor Tom Lenk takes a photo with his dog Charley on Monday, April 25. "Charley is looking more and more like her father everyday day. Or is it he other way around? I don't know any more. Either way, I'm so proud," Lenk said on Instagram.

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Pro golfers Rickie Fowler, left, and Justin Thomas take a photo together after they both made hole-in-ones at the Masters Par 3 Contest on Wednesday, April 6.

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Actor Alex Brightman snaps a selfie with comedian Jim Gaffigan backstage at the Broadway musical "School of Rock" on Sunday, April 3.